JPS5992846A - Paper feeder - Google Patents

Abstract

PURPOSE:To enable a paper feeder to accurately send paper for a printer, a plotter or the like, by pinch-conveying the paper with driving wheels and idle wheels, whose peripheral surfaces have protrusions and recesses that have a regular pattern and can be engaged with each other. CONSTITUTION:Driving wheels 2 are provided on a shaft 1 and rotated synchronously with the shaft. U-shaped members 4 are provided on a shaft 3. Idle wheels 6 are supported with shafts at the open tips of the U-shaped members 4. When paper is pinched between protrusions and recesses 24, 34 on the peripheral surfaces of the driving wheels 2 and the idle wheels 6, the protrusions and the recesses are engaged with each other. As a turning force is applied from a driver to the driving wheels 2 through the shaft 1 to rotate the driving wheels, the engagement is continuously effected to make numerous protrusions and recesses on the paper 8 and firmly bite and support it. In that case, the driving wheels 2 can be reversed to engage the protrusions 24, 34 with those of the paper 8 to prevent it from meandering, to convey the paper accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device that is simple and has excellent paper feeding accuracy.

Conventionally, as shown in FIG. 4, this type of device f is provided with a drive wheel 50 having an entrained outer periphery made of an elastic material such as rubber, and disposed at a position opposite the driving wheel 50, and has a regular pattern of irregularities on the outer periphery. The paper 52 is pressed between the idler wheel 51 and the driving wheel 5o.
K was designed to rotate the paper to feed the paper.

However, in such conventional paper feeding devices, deformation of the drive wheel or slippage between the drive wheel and the paper may occur during pinching, and paper feeding accuracy may be affected. There were drawbacks such as a decrease in the quality of paper and meandering of the paper.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a paper feeding device that is simple and has excellent paper feeding accuracy.

According to the present invention, a regular pattern of pads and holes that can mesh with the outer periphery of a drive wheel connected to a drive source and an idler wheel disposed opposite to the drive wheel are formed so as to mesh with each other. The feature is that paper is fed under pressure using an idler wheel.

The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a perspective view of a paper feeding device according to the present invention. I
It is a shaft that provides rotational force from the Fi drive source (not shown),
At least one drive wheel 2 is disposed on this shaft and is locked to rotate synchronously with the shaft 1. Further, on a shaft 5 parallel to the shaft 1, a U-shaped member 4 is disposed at a position facing the drive wheel 2, and an idler wheel 6 is mounted on the open end of the shaft 5 via a shaft 71C. There is. When the shaft 6 is rotated by a certain angle in the direction of arrow B, the idler wheel 6 is fully pressed against the drive wheel 2 by the spring 5, and on the other hand, when the shaft 3 is rotated by a certain angle in the direction of arrow B, the idler wheel 6 is pressed against the driving wheel 2 by the spring 5. 6 is away from the drive wheel 2, and the paper 8
can be freely inserted and removed.

FIG. 2 is an explanatory diagram of the driving wheel and the idler wheel, where (a) shows a front view of the driving wheel, and (a) shows a front view of the idler wheel. 24°3
Reference numeral 4 denotes a regular pattern of uneven portions surrounding the entire circumference, and both uneven patterns are formed in a shape that allows meshing. Although this uneven pattern is shown in this figure as a twill pattern diagonally intersecting the axis, it is needless to say that it is not limited to this.

FIG. 5 is an explanatory view of the paper clamping pressure part, where ←) shows a cross section of the clamping part along the axis, and (b) shows a partial cross section perpendicular to the axis. The driving wheel 2 and the idler wheel 6 move the paper along the uneven portions 24 on both outer peripheries.
．． 34, the uneven portions 24 and 34 are in mesh with each other through the paper, and a driving source (not shown) is inserted through the shaft 1.
When more rotational force is applied to the drive wheel 2, this tooth stage state is continuously observed as the drive wheel 2 rotates, forming many irregularities on the paper 8 and gripping the paper 8 strongly. At this time, when the driving wheel 2 is rotated in the reverse direction, the uneven portions 24 and 34 of the driving wheel and the idler wheel immediately engage with the unevenness group of the paper 8 that was previously formed, so that the paper 8 slips from the driving wheel 2. In addition to preventing the paper from meandering due to lateral deviation, it also enables highly accurate paper feeding.

As explained above, according to the present invention, the driving wheel and the idler wheel are provided with irregularities in a regular pattern that can mesh with each other on the outer periphery, and the paper is fed under pressure with a simple but excellent precision. Since it is possible to achieve a paper feed of 1,000 yen, if this device is applied to paper feeding devices that require precision, such as printers and plotters, it has the advantage of reducing costs and improving paper feeding accuracy.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a paper feeding device according to the present invention, Fig. 2 is an explanatory diagram of a driving wheel and an idler wheel, Fig. 3 is an explanatory diagram of a paper clamp pressure section, and Fig. 4 is a conventional paper feeding device. This is a conceptual diagram of Ken. 2... Drive wheel 6... Idle wheel 24.34... Uneven part 8... More than paper Applicant Epson Corporation Figure 1 2 (Q) 4 to 50 Figure 4 5/2 ===== Ko

Claims (1)

[Claims] In a paper feeding device having at least one drive wheel connected to a drive source and an idler wheel disposed at a position opposite to the drive wheel, a regular pattern of irregularities is formed on the outer periphery of the drive wheel, and the idler A paper feeding device characterized in that an unevenness is formed on the outer periphery of the wheel so that it can mesh with the unevenness, and the driving wheel and idler wheel feed the paper under pressure.